Brake



0a. 20, 1936. L; 5 LA BR E 2,057,723

' BRAKE Filed Feb. 24, 1953 3 Sheets-Shed 1 INVENTOR. Luaaze E. LQfiE/E A TTORNEY Oct. 20, 1936.

L. E. LA BRIE BRAKE Filed Feb. 24, 1933 3 Sheets-Sheet 2 INVENTOR. Luaaze E Lafie/z:

ATTORNEY Oct. 20, 1936. L, 5, LA E 2,057,723

' BRAKE Filed Feb. 24, 1955 s Sheets-Sheet s mug 4 i l! Ill lul V a 9 IN VEN TOR.

BY 8% a ATTORNEY atented ct. 20, 1936 BRAKE Application February 24, 1933, Serial No. 658,417

1 Claim.

This invention relates to automotive brakes and especially to hydraulic systems for operating said brakes and to methods of operating such systems.

One of the objects of this invention is to improve the methods of bleeding the air from the hydraulic cylinders and the associated conduits.

A further object of the invention is to improve the methods of and the means for attaching the wheel cylinders to the backing plates so as to increase the adju'stability thereof, to allow greater tolerances in manufacturing, to increase the ease of assembly, and to allow the cylinders to move to accommodate themselves to the swing of the shoes.

One of the features of my invention therefore is the arrangement of a wheel cylinder so that it is not rigidly secured to the backing plate but is pivoted thereon and clamped against excessive movement solely by friction.

A further feature of my invention is the special arrangement of the parts of the braking system of the automotive vehicle for bleeding. The structure disclosed includes conduit connections from the vehicle motor air intake system to the wheel cylinders whereby air is withdrawn from the braking system by vacuum.

Further objects and features of the invention will be apparent after a reading of the accompanying specification and claims and after consideration of the accompanying drawings in which:

Figure 1 is a more or less diagrammatic view of a braking system constructed according to my invention and connected up as in'the bleeding operation, parts of the system being shown in section;

Figure 2 is a transverse vertical section of the wheel brake shown in Figure 1;

Figure 3 is a sectional view of the wheel cylinder;

Figure 4 is a view similar to Figure 3 showing a modified form of mounting for the wheel cylinder;

Figure 5 is a view in side elevation of another modified form of mounting for the wheel cylinder;

Figure 6 is a view in section of the mounting shown in Figure 5;

Figure 7 is a view in side elevation of still another modified form of mounting;

Figure 8 is a view in section of the wheel cylinder shown in Figure 7; and

Figure 9 is another view in section of the wheel cylinder shown in Figure 7.

Referring particularly to Figures 1, 2, and 3 of the drawings in which is illustrated a brake embodying my invention, there is shown a master cylinder l adapted to actuate the brake shoes i2 and I3 by means of a wheel cylinder it which is connected to the master cylinder by a conduit H5. The cylinders l0 and It and the conduit l6 are normally maintained full of liquid which is supplied from a supply reservoir Hi.

When the system is first to be filled with liquid 10 and possibly periodically thereafter it is necessary that all air in the system be eliminated. To this end I provide in the cylinder I4 a bleeder opening 20 to which, during the bleeding operation, there is attached a conduit 22 leading to 30 although it is clear that it could be connected to other parts of the air intake system.

The master cylinder I 0 comprises essentially a hollow casting 32, a forward cap 3A to which the conduit I6 is attached, and a piston 36.

The casting is provided with openings 38 and 40 which are connected through conduit 42 with supply reservoir l 8. The piston is provided with resilient sealing cups M and 46, the latter being L-shaped in cross section. To the rear end of the piston 36 is attached a piston rod 48 which is connected to a foot pedal or other operating member. The rear end of the cylinder is provided with a flexible boot 5!] for preventing the entrance of dust, etc.

The braking structure at the wheel is shown clearly in Figure 2. Within the rotating drum 52 there are provided a pair of brake shoes l2 and I3 pivotally and adjustably connected by a ink 58. The shoes I2 and I3 are adapted to anchor on the free end of one of said shoes in forward braking and the free end of the other shoe in rearward braking bearing respectively upon an anchor pin 6|]. The shoes are normally held out of contact with the drum by springs such as 62, B4, 66 and 68, the spring 66 being attached to the backing plate 10.

- The cylinder M is provided with a pair of pistons 'H each having a piston link 12. Each of the links 12 acts on a pin 14 secured to one or the other of the shoes l2 and 83. Thus pressure in the liquid in the braking system spreads the wheel cylinder pistons and through the links 121 spreads the shoes into contact with the drum.

An auxiliary applying means is provided. It comprises a lever 16 provided with lugs 18 and 88. The lever 16 is loosely mounted to surround the anchor pin 68 and is operated through an operating link 82 by any suitable operating means. When the'lever 16 is rotated the lugs 18 and 88 act to spread the shoes into contact with the drum.

The casting which forms the cylinder, I4 is formed with a threaded cylindrical projection 84 which extends through an oversize circular opening 86 formed in the backing plate 18. 'The cylinder is secured non-rigidly to the backing plate 19 by nuts 88 and 98 threaded onto the projection, a washer 92 being interposed between the nut 98 and the backing plate 18. Because of the type of mounting, the cylinder may be easily adjusted to its best position, the tolerances allowable may be increased, and the assembly of the structure may be simplified. The projection '84 is formed with a bore 94 which forms the main supply opening to which the conduit I6 is connected and with a bore 96 which forms the bleeder opening 28 and through a which air is withdrawn from the system in bleeding. These bores both extend into the main chamber or the cylinder, the bleed bore 96 being normally closed by a threaded plug 98. i

In the embodiment shown in Figure 4, the bore I98 is inclined relative to the projection I84 and the opening, I86 is extended at one side by a.

. o the cylinder 2 is formed with a circular projection 284 extending through an opening 286 in the backing plate 218 and with a smaller oppositely extending circular projection 285. A bracket 281 fastenedto the backing plate 218 by bolts 289 and 29I. has an opening 293 through which the projection 285 loosely extends.

In the embodiment shown in Figures 7, 8, and 9 the cylinder 3I4 is formed with a solid portion 3I5 and superposed thereon has a substantially circular projection 384 The latter extends through a substantially circular openings-386 in the backing plate 318, the opening 388 being provided with slots 381 and 389. Bolts 39I and 393 extend through the slots 381 and 389 and are threaded into the solid portion 3I5. Washers 395 are positioned to bear on the backing plate 318 and on semicircular depressions 391 in the projection 384, being urged into contact therewith by the heads of bolts 39I and 393. It may be seen that the cylinder may rotate in the opening 386 except as restrained'by the bolts 39I and 393 in their movement within slots 381 and 389. Neither bore 394 nor 396 is concentric with projection 384, the latter being inclined to the backing plate. A plug 398 normally seals bore 396.

It is to be understood that the above described embodiments of my invention are for the purpose of illustration only and various changes may be made therein without departing from the spirit and scope of the invention.

I claim: In a hydrauliobrake system a backing plate 

